Calculating Set Pressure  
 

To determine the proper injection valve set point you must first calculate the hydrostatic column weight for the downhole capillary string that is to be installed.

Formula: .052 * fluid weight * bottom hole injection depth = hydrostatic column weight.
Example: On a 7500 foot well using a chemical with a density of 6.8lbs/gallon, the hydrostatic weight would be as follows: .052*6.8*7500 = 2652 psi.

The valve should be set for the calculated pressure plus the amount of back pressure needed to optimize your chemical pump’s performance. Normally 100–200 psi is sufficient for most pumps.

The valve in the above example would be set for about 2800 psi.

  


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